Common Concrete Leveling & Repair Questions
When does it make sense to raise my concrete rather than replace it?
Raising concrete can be a fantastic alternative to replacing concrete. If your concrete walkway, driveway, patio or floor is still structurally sound (no major cracks, flaking, scaling) and has just settled, then raising may be the most cost effective option. This is especially true if you only have a small section that needs to be repaired, since many concrete contractors will not do small jobs and then raising may be the only option. Also, raising concrete is a very quick and hassle free process compared to replacement – most projects are completed in around 1-2 hours
What makes polyurethane injection (PolyLifting) better than mudjacking?
The use of polyurethane to raise concrete and stabilize soil has many advantages compared traditional mudjacking which uses cement and sand. Below are just a few benefits:
- Longevity – Polyurethane will not shrink or breakdown over time
- Looks – smaller and fewer injections holes are needed.
- Performance –Extremely light compared to sand/cement and very effective at filling open voids
What causes concrete to sink?
Here are some of the most common reasons concrete slabs sink:
- Gravel base was never compacted properly during construction
- Concrete was built over soil that was once back-filled (such as around a foundation or pipe trench) and soil has now settled
- Water is draining or pooling around edge of slab which can cause the base to wash away over time
- Cracks and gaps in the concrete allow water to seep below the slab and cause seasonal frost heaving and errosion which can create voids
How long will the concrete leveling project take and when can we start using the concrete again?
Every job is different however a typical driveway leveling project will take on average around 1-3 hours depending on the number of slabs and the amount it needs to be raised. The polymer material is fully cured in only fifteen minutes. So once the crew has cleaned-up you can go back to walking and driveway on your concrete. However, if the cracks were sealed as part of the project then you would want to wait at least an hour before driving over them.
How long will my concrete stay level?
This is our most common question, for good reason, why spend money on something that wont last. The polymer used to raise your concrete is designed to not change shape and size overtime. It’ s strong stuff. However, we can’t say that for the soil below the polymer. If the soil moves over time than it makes no difference how strong our material is. With that being said, the polymer is extremely light-weight which reduces the chance of further settling. Also, sealing all cracks and gaps to stop any erosion below the slab and making sure there is proper drainage around the concrete (downspout extensions) will greatly help as well. Lastly, we do offer a 5 year warranty on our PolyLifting services assuming the joint and cracks have been sealed and drainage issues corrected.
Can all concrete be raised?
No. Concrete that is too badly cracked is usually better off being replaced. In order to level a slab properly the cracked section can be no less than two feet x two feet in size. Also areas in which there are obstacles in the way that would restrict the slab from moving such as structures or trim boards. The estimator will inspect the area during the onsite visit to determine if there may be any issues in completing the work.
What if the slab is lifted to high?
Lifting a slab too high is very unlikely. Concrete raising using polyurethane is a slow and controlled process. Our technicians are experts at taking their time to ensure the slab is being raised properly. This means material is injected in short bursts to avoid an over lift.
Is Polyurethane Concrete Leveling safe for the Environment?
Yes. We use only environmentally friendly polyurethane on all projects. Features include:
- No toxic heavy metal catalysts.
- No ozone depleting products (ODP).
- No bromine or other halogenated components.
- No formaldehyde components.
- Mildew, bacteria, and fungus resistant.
- Contains renewable resource components.
- Considered safe for burial and landfill disposal.
- Compliant with USDA/FDA requirements for incidental food contact.
- Zero VOC and solvent free
When can I use my concrete after sealing the cracks and joints with SuperFlex?
Typically it only takes about an hour until the sealant is able to withstand foot traffic and vehicles without getting damages. It may take an extra hour when the temperature is below 60 degrees.
I have a large gap between my driveway and garage floor. Can that be sealed with SuperFlex?
Yes! The joint between the driveway and garage is the most common and important area to seal. The fiber expansion joint board installed during construction typically will deteriorate and leave a large gap that allows water from your garage floor to seep below your driveway. Since the driveway may move with the ground and the garage floor typically wont, SuperFlex is the perfect sealant because of its superior flexibility.
Can you seal all cracks?
No. Hairline cracks not large enough to fit a quarter in it are to thin to accept the sealant. Typically these thin cracks don’t need to be sealed and it’s best to leave them along. Also concrete with large cracks and or many cracks may be beyond repair and replacement would be the only option.
Will the SuperFlex crack sealant match the color of my concrete?
The sealant is grey, which matches the color of new concrete. For older concrete, we add sand to give it a more tan color, which better matches weathered concrete. An exact match is not possible but many times its pretty close.
Can I buy SuperFlex at big box hardware stores?
No. SuperFlex is 100% silicone, which makes it more costly than polyurethane based caulks for concrete. Since big box stores look to keep prices down they opt for the low cost caulks for concrete.